Messages in this thread | | | Subject | Re: CD writing in future Linux (stirring up a hornets' nest) | From | Bernd Petrovitsch <> | Date | Wed, 01 Feb 2006 16:55:03 +0100 |
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On Wed, 2006-02-01 at 16:37 +0100, Jan Engelhardt wrote: [...] > >Do we need to expose IDE master/slave, primary/secondary concepts in Linux? > > > AFAICS, we do. hda is always primary slave, etc. With the SCSI layer it's > (surprisingly) the other way round, sda just happens to be the first disk > inserted (SCA, USB, etc.)
The (historical) reason was: There were not enough major/minor numbers (IIRC 8 bit for each of them) for a sane (and static) SCSI device number mapping (similar to IDE) - just multiply the possible # of partitions * # of LUNs * # IDs for a few controllers.
Bernd -- Firmix Software GmbH http://www.firmix.at/ mobil: +43 664 4416156 fax: +43 1 7890849-55 Embedded Linux Development and Services
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